var database = 'ClientDW_B'//db.getSiblingDB(database).RPIndicatorExtended.find({})db.eval(function(databaseName){	db.getSiblingDB(databaseName).RPIndicatorExtended.find({'Comments': { $gte: [] }}).forEach(function(item){
		var comment = null;
		if (item.Comments[0] != undefined)
			comment = item.Comments[0];	   
		item.Comments = comment;
		db.getSiblingDB(databaseName).RPIndicatorExtended.save(item);
	});})